ProofpointPOD - Multiple large emails to the same recipient

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Id	d1aba9a3-5ab1-45ef-8ed4-da57dc3c0d32
Rulename	ProofpointPOD - Multiple large emails to the same recipient
Description	Detects when multiple emails with large size where sent to the same recipient.
Severity	Medium
Tactics	Exfiltration
Techniques	T1567
Required data connectors	ProofpointPOD
Kind	Scheduled
Query frequency	30m
Query period	30m
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Proofpoint On demand(POD) Email Security/Analytic Rules/ProofpointPODMultipleLargeEmailsToSameRecipient.yaml
Version	1.0.1
Arm template	d1aba9a3-5ab1-45ef-8ed4-da57dc3c0d32.json

KQL

let lbtime = 30m;
let msgthreshold = 3;
let msgszthreshold = 3000000;
ProofpointPOD
| where TimeGenerated > ago(lbtime)
| where EventType == 'message'
| where NetworkDirection == 'outbound'
| where NetworkBytes > msgszthreshold
| summarize count() by SrcUserUpn, DstUserUpn
| where count_ > msgthreshold
| extend AccountCustomEntity = SrcUserUpn

YAML

name: ProofpointPOD - Multiple large emails to the same recipient
id: d1aba9a3-5ab1-45ef-8ed4-da57dc3c0d32
query: |
  let lbtime = 30m;
  let msgthreshold = 3;
  let msgszthreshold = 3000000;
  ProofpointPOD
  | where TimeGenerated > ago(lbtime)
  | where EventType == 'message'
  | where NetworkDirection == 'outbound'
  | where NetworkBytes > msgszthreshold
  | summarize count() by SrcUserUpn, DstUserUpn
  | where count_ > msgthreshold
  | extend AccountCustomEntity = SrcUserUpn  
entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: FullName
    columnName: AccountCustomEntity
relevantTechniques:
- T1567
description: |
    'Detects when multiple emails with large size where sent to the same recipient.'
queryPeriod: 30m
status: Available
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Proofpoint On demand(POD) Email Security/Analytic Rules/ProofpointPODMultipleLargeEmailsToSameRecipient.yaml
kind: Scheduled
triggerOperator: gt
severity: Medium
version: 1.0.1
queryFrequency: 30m
tactics:
- Exfiltration
triggerThreshold: 0
requiredDataConnectors:
- connectorId: ProofpointPOD
  dataTypes:
  - ProofpointPOD_message_CL

ARM